My Spark Go shipped today.  It's even smaller, quite a bit smaller, than the Spark Mini... think of it as an extra thick iPhone.  I ordered it on a lark, the pre-release price being a significant drop from the retail price.  

I'm considering the purchase a 'toy' but I thought it might work when and if I ever take my electric to a get together... something I've never done before.  Or a second amp for when I have a visiting player... something that has happened before.  😉

Anyhoo... at the worse it will serve as a Bluetooth speaker for streaming.  My expectations are low so any disappointment will be minor.  

I didn't do the due diligence you did... the Go is a new product and wasn't scheduled to ship until "late May."  We shall see.

https://www.positivegrid.com/products/spark-go